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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
 3 Months Ended 12 Months Ended
Feb. 28, 2011
May 31, 2010
Feb. 29, 2012
Y
Feb. 28, 2011
Feb. 28, 2010
Goodwill, intangible and other long-lived assets and impairments          
Non-cash impairment charges $ 1,660,000 $ 501,000   $ 2,161,000 $ 900,000
Non-cash impairment charges after tax       2,100,000 890,000
Economic useful lives and amortization of intangible assets          
Period over which intangible assets are amortized, low end of range (in years)     2    
Period over which intangible assets are amortized, high end of range (in years)     30    
Intangible asset amortization     $ 20,069,000 $ 9,888,000 $ 6,128,000
Patent
          
Capitalized costs in connection with the design and development of products to be covered by patents          
Useful life of intangible asset, typical life of patent     14